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如何在Flutter中实现文本自动滚动？

mobileflutterdart
11
我想要实现的是一个多行文本，它会以固定速度自动滚动直到列表末尾。

AutoScroll Example

这是一个做类似事情的不同应用程序。有没有在Flutter中完成这个的方法？

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  ScrollController _scrollController = ScrollController();
  _scrollToBottom() {
    _scrollController.animateTo(_scrollController.position.maxScrollExtent,
        duration: Duration(seconds: 30), curve: Curves.linear);
  }

  @override
  Widget build(BuildContext context) {
    WidgetsBinding.instance.addPostFrameCallback((_) => _scrollToBottom());
    String val = '''
BUNCH OF TEXT HERE.
''';
    return Scaffold(
      appBar: AppBar(
        title: Text('Lyrics'),
      ),
      body: SingleChildScrollView(
        controller: _scrollController,
        child: Text(
          val,
          maxLines: 1000,
        ),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

我在自动滚动底部的时候添加了大量lorem ipsum文本，以特定速度滚动。在当前设置中，文本将在30秒内自动滚动到底部。
但是我想要的是一个按钮，我可以按下它来开始滚动。如果可能的话，使用速度代替时间。
编辑：根据下面的答案，文本确实会滚动。但是我遇到的问题是，如果进行任何手动干预，则滚动停止。有没有办法在不再次按下该按钮的情况下恢复滚动？
提前感谢。
你是说只需点击一次按钮，它就会持续滚动吗？ - 10101010
是的。使用我现有的代码，它会在页面加载时开始滚动。我相信我也可以用一个按钮来实现这个功能。但是，如果我想手动停止滚动，我希望它能继续滚动。如果有意义的话。 - moficodes
但是手动停止滚动的部分我没有明白。 - 10101010
1
当滚动动画正在进行时，如果我触摸屏幕，它会停止滚动。 - moficodes
1个回答
14

添加了一个名为speedFactor的变量。增加它会增加滚动速度，反之亦然。

如果持续时间是恒定的，在向底部滚动时速度会降低。这是因为我们试图在相同的持续时间内覆盖不同的距离，这意味着您的速度必须变化。

所以为了解决这个问题，我正在调整持续时间以保持恒定的速度因子。

double maxExtent = _scrollController.position.maxScrollExtent;
double distanceDifference = maxExtent - _scrollController.offset;
double durationDouble = distanceDifference / speedFactor;
为了停止动画，我只需使用animateTo当前的offset，这将停止动画，因为我们已经到达了偏移量，没有更多内容可以进行动画。
下面是一个可行的示例。
import 'package:flutter/material.dart';
import 'dart:async';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> with TickerProviderStateMixin {
  ScrollController _scrollController = ScrollController();
  bool scroll = false;
  int speedFactor = 20;

  _scroll() {
    double maxExtent = _scrollController.position.maxScrollExtent;
    double distanceDifference = maxExtent - _scrollController.offset;
    double durationDouble = distanceDifference / speedFactor;

    _scrollController.animateTo(_scrollController.position.maxScrollExtent,
        duration: Duration(seconds: durationDouble.toInt()),
        curve: Curves.linear);
  }

  _toggleScrolling() {
    setState(() {
      scroll = !scroll;
    });

    if (scroll) {
      _scroll();
    } else {
      _scrollController.animateTo(_scrollController.offset,
          duration: Duration(seconds: 1), curve: Curves.linear);
    }
  }

  @override
  Widget build(BuildContext context) {
    String val = '''
BUNCH OF TEXT HERE. BUNCH OF TEXT HERE. BUNCH OF TEXT HERE. BUNCH OF TEXT HERE. BUNCH OF TEXT HERE. BUNCH OF TEXT HERE. BUNCH OF TEXT HERE. BUNCH OF TEXT HERE. BUNCH OF TEXT HERE.BUNCH OF TEXT HERE.BUNCH OF TEXT HERE.BUNCH OF TEXT HERE.BUNCH OF TEXT HERE.BUNCH OF TEXT HERE.BUNCH OF TEXT HERE. BUNCH OF TEXT HERE.v 
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''';
    return Scaffold(
      appBar: AppBar(
        title: Text('Lyrics'),
      ),
      body: NotificationListener(
        onNotification: (notif) {
          if (notif is ScrollEndNotification && scroll) {
            Timer(Duration(seconds: 1), () {
              _scroll();
            });
          }

          return true;
        },
        child: SingleChildScrollView(
          controller: _scrollController,
          child: Text(
            val,
            maxLines: 1000,
          ),
        ),
      ),
      floatingActionButton: FloatingActionButton(onPressed: () {
        _toggleScrolling();
      }), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

更新：添加了代码，使得滚动视图在用户中断后继续滚动。

谢谢您的回复。您知道我如何在触摸屏幕或手动滚动后重新启动滚动吗？目前，如果您在动画正在进行时触摸屏幕，它只会停止。 - moficodes
我所询问的是，是否有任何方法可以在用户停止滚动或触摸屏幕后使滚动重新开始。 - moficodes
是的，我们可以做到，但需要写更多的代码。 - 10101010
我还没有尝试过，但我认为这个解决方案是可行的。 - Kamlesh
@10101010 我该如何实现文本的缩放和自动滚动？ - Rahul Vyas
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